- Donna had two normal vaginal births. However, during the third pregnancy, she

Question

- Donna had two normal vaginal births. However, during the third pregnancy, she was diagnosed with issues gestational diabetes. She delivered full term to a healthy, 10 pound male. The obstetrician noticed an abnormal appearing left upper limb; the arm is adducted to the side and is medially rotated and pronated.

D) What brachial muscle is probably not involved in the condition?

- A 12-year-old boy was running down the hallway with a fork in his mouth and falls , causing a traumatic injury to the lateral pterygoid muscle.

C) What action of mastication would be affected by this injury?

- A 36-year-old female presents to the ED after a t-bone motor vehicle accident. Her cheif complaint is severe pain when she attempts to abduct her arm.

A) What is the common name for this type of injury?

B) List the four muscles most commonly injured when an abducted arm recieves an indirect force

C) Which of the above muscles medially rotates and adducts the arm?

D) Which of the above muscles laterally rotates and aducts the arm?

Explanation / Answer

Coracobrachialis is involved in the adduction of the arm , Bicep Brachii deals with lifting of the arm ,Brachialis deals with the reflexion phenomenon , Thus the muscle probably not involved is Tricep Brachii no doubt it is the major muscle in the upper arm but mainly deals with extension of the elbow i.e, straighting of the arm.

A concerted effect of the lateral pterygoid muscles help in lowering the mandilble and opening the jaw. So. basically form other functions of Lateral pterygoid muscle it a;so asists in depressing the mandible. Now its clear for the process of mastication the jaw need to b lowed which is hindered is this particular muscle is injured..

A) Involvement to the Deltoid muscle plays the major role in abduction of the arm, so simply the injury can b refered as Deltiod Rupture. Or else if dealing with bones commonly it can be termed as Collar Bone/ Clavicle Fracture.

B) The four muscles are:

C) Muscles involved in Medial rotation of arm is Subscapularis and adduction due to Deltiod muscle and Infraspinatus.

D) Muscles involved in Lateral rotaion of arm is Infraspinatus and adduction due to Deltoid and Subscrapularis.

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